Mathematica error when solving a DE -- "exceeded RecursionLimit"

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SUMMARY

The forum discussion addresses an error encountered in Mathematica when attempting to solve a differential equation, specifically the "exceeded RecursionLimit" issue. Users suggest using the DSolve function with explicit equations, such as sol=DSolve[y''[x]==-y[x],y[x],x], and recommend clearing any previous definitions of the variable x before executing the code. These steps are essential for resolving the recursion limit error and successfully plotting the solution.

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Homework Statement:: I don't know where the mistake is happening. I need to solve the give differential equation in mathematica and have to plot it but i am facing problem in doing so.
Can anyone help me in this?
Relevant Equations:: I have attached the picture of equation as well as my mathematica code.

IMG-20210607-WA0020.jpeg
20210608_075359.jpg
 
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not sure, maybe try sol=DSolve[eqn,y[x],x], that is put y[x] there instead of just y.
Also try putting the equation explicitly into the DSolve command, for example like
sol=Dsolve[y''[x]==-y[x],y[x],x]
 
What is x. It looks like x is defined somewhere above. Try clearing x first and then re run your code
 

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